Sidewalk Cement Slabs

Make your own concrete
slabs instructions.




Hand Mixed
Concrete Slabs



Design, Build Sidewalk
Slabs Yourself.

Sidewalk plywood forms,
two forms side-by-side



Making Concrete
Slabs Instructions



Build a form that you can use
more than one time.

Decide on the size you wish
to make your slabs.

The ones shown here are 16
inches by 17 inches to meet
this particular need for a
concrete floor in a wood shed.

The 4x8 sheet of plywood was
divided up into two equal
sides which fitted five slabs on
each half of the plywood.

2 inch by 2-inch struts were
used to make form dividers,
actually 2x4, cut down the
center.

Nail or screw the outer 2x2
perimeter to the 3/4 inch
thick plywood.

Make the cross interior struts
removable by securing them
from the outer 2 x 2 perimeter
with screws, (drill pilot holes).

Removable slats make it easy
to remove the slabs when
they have cured.

They will easily fall out of the
form when the dividers
are removed.

Tip



When you have completed
making the forms, paint the
form parts, this helps prevent
the cement from sticking.

Take a black felt pen and
number each slat and form,
so the same slat will go
back in the same place,
and the retaining screw
hole in the perimeter 2 by
2, will line up perfectly
with the cross slat.


Mixing concrete by hand,
in a wheel barrel.


Oil the complete inside of
the form with any kind of
oil, such as used engine oil.

This also helps prevent the
concrete from sticking to
the form.

Make crosses from rebar
and wire together in the
center.

Wire cable was used in
these forms.
An angle grinder was used
to cut the cable to length.

Place one cross in each square.

Working with a full sized
wheelbarrow, shovel 15
shovelfuls of sand/gravel
into the wheelbarrow.

Add 5 shovelfuls of Portland
all-purpose cement.

Use a garden hoe and mix
the two dry ingredients.

Add a bucket full of water
and continue mixing,
adding more water as
needed.

The correct mixture is one
part of cement to three parts
of sand/gravel.

If you use gravel in your
concrete slabs, the mixture
is 60% sand, 40% 3/4 inch
crushed gravel.

If you use sand/gravel,
the mix is one part cement
to 4 parts sand/gravel.

When you can bring up a wave
of cement without it collapsing,
it is the right stiffness.


Forms filled with concrete


Shovel the mixed cement
from the wheelbarrow, into
he forms, a wide flat shovel
works best.

One sack of cement will make
ten concrete slabs.

It takes two wheel barrel
mixes to make ten slabs.

Leveled, toweled and edged


Finishing


After pouring the cement into
the forms, trowel it level.

Wait about half an hour for
the cement to firm up, time
depends on temperature.




Run a straw broom lightly over
the form to create a texture.

Use a cement edger and go
around each individual slab.

If it is sunny day, cover with
a tarp to prevent the cement
from drying to quickly.
Drying to fast will cause the
cement to crack.

Sprinkle the concrete lightly
with water two or three times
a day.

Wait two days, then remove
the screws from the divider slats.

Gently tip the form over allowing
the slabs to fall away from the
form onto soft ground.

Take care in handling the slabs
at this stage, as they will not
be fully cured for another 7
to 10 days.

Stack them upright so the
air can ventilate around them.
Sprinkle the slabs
with water, as needed.

Finished slabs left to cure
finished concrete slabs removed from forms
After each use, scrape away
all traces of cement that may
be sticking to the forms.

A garden hoe works well.
Scrape away what you can,
and finish up with the garden
hose.

Replace the dividers, in their
original position, and secure
with screws.

Re Oil the forms and you are
ready for the next mix.


Finished concrete woodshed floor


This view shows concrete slabs
in place, forming the floor for
the wood shed.

The slabs were laid over a layer
of sand and weed control fabric.


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